CN109610481B - Support treatment construction method for tunnel portal bedding strong weathering rock high and steep side slope - Google Patents
Support treatment construction method for tunnel portal bedding strong weathering rock high and steep side slope Download PDFInfo
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- CN109610481B CN109610481B CN201811431795.6A CN201811431795A CN109610481B CN 109610481 B CN109610481 B CN 109610481B CN 201811431795 A CN201811431795 A CN 201811431795A CN 109610481 B CN109610481 B CN 109610481B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/205—Securing of slopes or inclines with modular blocks, e.g. pre-fabricated
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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Abstract
The invention discloses a supporting treatment construction method for a tunnel portal bedding strong weathered rock high and steep side slope, which comprises the following steps: (1) arranging densely-arranged steel pipe piles which are distributed in an approximate semicircular arc shape along the outside of the design boundary of the main body side slope, constructing and arranging U-shaped drainage grooves along the inner sides of the densely-arranged steel pipe piles, paving a geogrid within a range of 1-2 m along the outer sides of the densely-arranged steel pipe piles, and spraying a layer of concrete on the surface of the geogrid; (2) arranging anchor cable frame beam structures on the surface of a side slope on the inner side of the densely-arranged steel pipe piles, building a concrete layer slightly higher than the frame beams along the inner side of each frame, and uniformly arranging hollow polygonal edge blocks in the frames; (3) uniformly arranging a plurality of reinforced concrete piles at intervals along the left side and the right side of the design boundary of the tunnel portal; (4) and excavating a foundation pit along the outer side of the reinforced concrete pile, and constructing a reinforcement cage along the foundation pit and around the reinforced concrete pile to construct a retaining wall structure. The method can effectively solve the problem of treatment of the bedding strong weathering rock high and steep slope, and has the advantages of high-efficiency construction, safe structure and the like.
Description
Technical Field
The invention belongs to the technical field of civil engineering construction, and particularly relates to a supporting treatment construction method for a tunnel portal bedding strong weathered rock high and steep side slope.
Background
Along with the continuous increase of highway and railway mileage in China, more and more projects need to be constructed under the condition of complex landforms, and the tunnel excavation in the mountainous area becomes the normal state for constructing roads in the mountainous area. Because the terrain in mountainous areas is complex, the geological change is large, the slope support is very important, and in recent years, along with the development of engineering construction, slope collapse accidents often occur, and the personal and property safety is seriously threatened.
The existing retaining wall, anti-slide pile, anchor cable frame beam, soil nail wall and other structures commonly used for slope retaining protection are mainly used for slope protection with better foundation condition and lower height, but when the slope is faced with unfavorable geological conditions and an ultrahigh or steep slope, a single supporting mode is poor in using effect, and the efficient supporting effect cannot be achieved. Particularly, when the treatment of poor side slopes such as tunnel portal bedding strong weathering rocks is involved, the single supporting mode is more difficult to achieve the effect of effectively preventing the side slope from collapsing due to the complex geological conditions in mountainous areas and the large disturbance caused by tunnel excavation construction.
Disclosure of Invention
In order to solve the technical problems, the invention provides a supporting treatment construction method for a tunnel portal bedding strongly weathered rock high and steep side slope, which can effectively treat the complicated rock-soil layer high and steep side slope and has the advantages of high-efficiency construction, safe structure and the like.
In order to achieve the purpose, the invention adopts the following technical scheme: a supporting treatment construction method for a tunnel portal bedding strong weathered rock high and steep side slope comprises the following construction steps:
(1) constructing and arranging a plurality of hollow steel pipes which are distributed approximately in a semicircular arc shape along the outside of the design boundary of the main body slope, forming a plurality of holes on the hollow steel pipes, injecting concrete into the hollow steel pipes to form densely-arranged steel pipe piles, constructing and arranging U-shaped drainage grooves along the inner sides of the densely-arranged steel pipe piles, ensuring that the insertion depth of the steel pipe piles is far greater than the depth of the U-shaped drainage grooves, paving geogrids along a slow slope section or a gentle section rock-soil layer within the range of 1-2 m outside the densely-arranged steel pipe piles, spraying a layer of concrete on the surface of the geogrids, and controlling the sprayed concrete layer to form a micro-slope shape towards the U-shaped drainage grooves;
(2) designing and arranging an anchor cable frame beam structure on the slope surface of the inner side of the densely-arranged steel pipe pile, building a concrete layer slightly higher than the frame beam along the inner side of each frame of the anchor cable frame beam structure to form a slope drainage channel, then uniformly arranging hollow polygonal edge blocks in the formed rectangular frame, and backfilling rock soil in gaps between the hollow parts of the polygonal edge blocks and the edge blocks;
(3) a plurality of reinforced concrete piles are uniformly and horizontally arranged at intervals along the left side and the right side of the design boundary of the tunnel portal;
(4) and excavating a foundation pit along the outer side of the reinforced concrete pile, ensuring that the embedded depth of the reinforced concrete pile is greater than the maximum depth of excavation of the foundation pit, and constructing a reinforcement cage along the foundation pit and around the reinforced concrete pile to construct a retaining wall structure with a terrace-shaped bottom.
Furthermore, the insertion depth of the hollow steel pipe is 5-8 m downwards along the surface of the vertical slope, and the depth of the U-shaped water drainage groove is 0.8-1.5 m.
Further, in the step (2), hollow regular hexagonal blocks and rectangular blocks are uniformly arranged in the formed rectangular frame, and the thickness of the polygonal square blocks is controlled to be slightly lower than the height of the rectangular frame beam.
Furthermore, the embedding depth of the reinforced concrete pile is 9-12 m below the ground surface, and the upper limit of the reinforced concrete pile is basically consistent with the lower limit of the slope in height.
Furthermore, the bottom of the foundation pit is sequentially and outwards set into a terrace type structure along one side close to the reinforced concrete pile, the excavation depth and the width of the foundation pit are about 4-6 m, and the length of the foundation pit is basically consistent with the distance from the tunnel portal to the side slope boundary on one side.
Furthermore, the height of the retaining wall, the upper limit height of the reinforced concrete pile and the lower limit height of the slope design are basically consistent.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, U-shaped drainage grooves and a geogrid are laid on a gentle slope section or a gentle section rock-soil layer within the range of 1-2 m along the outer side of a densely-arranged steel pipe pile through construction, a concrete layer slightly in a micro-slope shape is formed towards the U-shaped drainage grooves by spraying along the surface of the geogrid, and a concrete layer slightly higher than a frame beam is built along the inner side of each frame of an anchor cable frame beam structure to form a side slope drainage channel, so that a good drainage system is formed, and the side slope is prevented from being eroded by rainwater to increase the risk of side slope collapse to a certain extent;
2. according to the invention, the insertion depth of the steel pipe piles and the embedding depth of the reinforced concrete piles are strictly controlled, so that the densely arranged steel pipe piles bear the acting force of the external rock-soil layer of the side slope and the U-shaped drainage channel at the same time, the side slope is prevented from being influenced by the rock-soil layer outside the boundary of the side slope to a certain extent, meanwhile, the reinforced concrete piles are ensured to bear the multidirectional inward horizontal supporting action of the side slope, the retaining wall and the surrounding rock-soil layer at the same time, the integral contact of the whole side slope and the retaining wall structure is effectively avoided, the construction safety is greatly improved, and the integral stability of the side slope is enhanced;
3. according to the invention, the hollow regular hexagonal prism blocks and the rectangular prism blocks are uniformly arranged in the rectangular anchor cable frame, and the rock-soil layer is backfilled along the prism block gap region, so that the weathering effect of the slope rock-soil layer due to long-term direct contact with the atmosphere is effectively avoided;
4. according to the invention, the bottom of the retaining wall is set to be the terrace-type structure, and the distance and the height difference between the retaining wall structure and the concrete pile are strictly controlled, so that the adverse effect caused by soil layer instability in the excavation construction process of the foundation pit is effectively solved, the construction potential safety hazard is reduced, and the overall stability of the side slope is enhanced.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
the labels in the figure are: the concrete pile comprises 1-densely arranged steel pipe piles, 2-U-shaped drainage grooves, 3-geogrid concrete layers, 4-anchor rope piles, 5-hollow regular hexagonal blocks, 6-hollow square blocks, 7-rock-soil layers, 8-anchor rope frame beam structures, 9-tunnel construction sections, 10-retaining wall structures and 11-reinforced concrete piles.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Example (b): the side slope is a 43m bedding strong weathering rock high-gradient side slope formed after a certain railway engineering mountain is excavated, and a railway tunnel construction section is arranged below the side slope. As shown in fig. 1 and 2, a supporting and governing construction method for a tunnel portal bedding strongly weathered rock high and steep side slope is characterized in that firstly, a plurality of hollow steel pipes which are distributed approximately in a semicircular arc shape are constructed and arranged outside a design boundary of a main body side slope, a plurality of holes are formed in the hollow steel pipes, concrete is injected into the hollow steel pipes, the concrete penetrates through the holes and forms cement soil with surrounding rock soil, so that a densely arranged steel pipe pile 1 is formed, the insertion depth of the steel pipe pile 1 is controlled to be 7m, and a U-shaped drainage groove 2 with the depth of 1m is constructed and arranged along the inner side of the densely arranged steel pipe pile 1, so that the densely arranged steel pipe pile 1 is simultaneously supported by the external rock soil layer of the side slope and the U-shaped drainage groove 2, and the stability of the densely arranged steel; and then, paving a geogrid along the rock-soil layer of the gentle slope section within the range of 2m outside the densely-arranged steel pipe pile 1, spraying a layer of concrete on the surface of the geogrid, and ensuring that the sprayed concrete layer forms a micro-slope shape towards the U-shaped drainage groove 2 to form a geogrid concrete layer 3, thereby forming a drainage channel and a supporting structure in the supporting and governing construction method for the bedding strong weathering rock high and steep slope of the tunnel portal.
Uniformly drilling 30 drill holes with the depth of 13m at intervals along a high and steep slope on the inner side of the densely arranged steel pipe pile, embedding anchor cables along the drill holes, and injecting concrete into the anchor cable holes to form anchor cable piles 4; excavating grooves with the depth of 30cm along the horizontal direction and the vertical direction of the anchor cable piles 4, arranging reinforcement cages along the grooves, fixedly connecting the reinforcement cages with joints of the anchor cable piles 4 together, pouring concrete along the reinforcement cages to form anchor cable frame beam structures 8, and building a concrete layer slightly higher than the frame beams along the inner sides of each frame of the anchor cable frame beam structures 8 to form side slope drainage channels, so that a good drainage system is formed, and the side slopes are prevented from being corroded and damaged by rainwater to a certain extent; after concrete is solidified, cutting surface rock soil in a formed rectangular frame and leveling, spraying thin-layer concrete on the surface of the rectangular frame, uniformly arranging hollow hexagonal blocks 5 and rectangular blocks 6 with the thickness of 12cm, and backfilling the rock soil in gaps between the hollow parts of the hexagonal blocks 5 and the rectangular blocks 6 and between the prismatic blocks and the frame to form a side slope supporting system integrating anchor cable piles 4, reinforcement cage concrete, hollow regular hexagonal prismatic blocks 5 and rectangular blocks 6, so that the defect of infirm single supporting mode is effectively avoided.
Finally, follow the design limit left and right sides of tunnel entrance to a cave 9 and respectively the even level in interval and arrange many reinforced concrete pile 11, the buried degree of depth of reinforced concrete pile 11 is for by the below ground 9m, excavate the deep foundation ditch of 6m along the reinforced concrete pile 11 outside, along every interval 1m of foundation ditch bottom height and outwards build the steel reinforcement cage around the reinforced concrete pile and build formation terraced fields type retaining wall structure 10 of three-step, finally form reinforced concrete pile 11 and receive the side slope simultaneously, retaining wall 10 and the multidirectional interior level supporting role on ground layer 7 on every side, effectively avoid side slope and retaining wall 10 direct contact to the overall stability of side slope has been strengthened.
Many modifications and other embodiments of the invention will come to mind to one skilled in the art to which this invention pertains having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (6)
1. A supporting treatment construction method for a tunnel portal bedding strong weathered rock high and steep side slope is characterized by comprising the following steps: the method comprises the following construction steps:
(1) constructing and arranging a plurality of hollow steel pipes which are distributed approximately in a semicircular arc shape along the outside of the design boundary of the main body slope, forming a plurality of holes on the hollow steel pipes, injecting concrete into the hollow steel pipes to form densely-arranged steel pipe piles, constructing and arranging U-shaped drainage grooves along the inner sides of the densely-arranged steel pipe piles, ensuring that the insertion depth of the steel pipe piles is far greater than the depth of the U-shaped drainage grooves, paving geogrids along a slow slope section or a gentle section rock-soil layer within the range of 1-2 m outside the densely-arranged steel pipe piles, spraying a layer of concrete on the surface of the geogrids, and controlling the sprayed concrete layer to form a micro-slope shape towards the U-shaped drainage grooves;
(2) designing and arranging an anchor cable frame beam structure on the slope surface of the inner side of the densely-arranged steel pipe pile, building a concrete layer slightly higher than the frame beam along the inner side of each frame of the anchor cable frame beam structure to form a slope drainage channel, then uniformly arranging hollow polygonal edge blocks in the formed rectangular frame, and backfilling rock soil in gaps between the hollow parts of the polygonal edge blocks and the edge blocks;
(3) a plurality of reinforced concrete piles are uniformly and horizontally arranged at intervals along the left side and the right side of the design boundary of the tunnel portal;
(4) and excavating a foundation pit along the outer side of the reinforced concrete pile, ensuring that the embedded depth of the reinforced concrete pile is greater than the maximum depth of excavation of the foundation pit, and constructing a reinforcement cage along the foundation pit and around the reinforced concrete pile to construct a retaining wall structure with a terrace-shaped bottom.
2. The support treatment construction method for the tunnel portal bedding strongly weathered rock high and steep side slope according to claim 1, characterized by comprising the following steps: the insertion depth of the hollow steel pipe is 5-8 m downwards along the surface of the vertical slope, and the depth of the U-shaped drainage groove is 0.8-1.5 m.
3. The support treatment construction method for the tunnel portal bedding strongly weathered rock high and steep side slope according to claim 1, characterized by comprising the following steps: and (3) uniformly arranging hollow regular hexagonal blocks and square blocks in the formed rectangular frame in the step (2), and controlling the thickness of the polygonal prismatic blocks to be slightly lower than the height of the rectangular frame beam.
4. The support treatment construction method for the tunnel portal bedding strongly weathered rock high and steep side slope according to claim 1, characterized by comprising the following steps: the embedded depth of the reinforced concrete pile is 9-12 m below the ground surface, and the upper limit of the reinforced concrete pile is basically consistent with the lower limit of the side slope.
5. The support treatment construction method for the tunnel portal bedding strongly weathered rock high and steep side slope according to claim 1, characterized by comprising the following steps: the foundation ditch bottom outwards sets gradually into terrace type structure by one side along being close to reinforced concrete pile, and the foundation ditch excavation degree of depth and width are 4 ~ 6m, and foundation ditch length keeps unanimous basically with the distance along tunnel entrance to one side slope limit.
6. The support treatment construction method for the tunnel portal bedding strongly weathered rock high and steep side slope according to claim 1, characterized by comprising the following steps: the height of the retaining wall, the upper limit height of the reinforced concrete pile and the lower limit height of the slope design are basically consistent.
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| CN110185041B (en) * | 2019-05-28 | 2021-04-23 | 浙江大学宁波理工学院 | Support and waterproof integrated structure for height-limited site and construction method thereof |
| CN110847195A (en) * | 2019-10-08 | 2020-02-28 | 中铁隧道局集团建设有限公司 | Construction method for stable treatment of side and upward slope of large-block-diameter loose rock pile body opening |
| CN114809039A (en) * | 2022-06-06 | 2022-07-29 | 新疆北新路桥集团股份有限公司 | Mountain slope supporting structure and mountain slope supporting method |
| CN115198793B (en) * | 2022-07-08 | 2023-07-04 | 中铁二院工程集团有限责任公司 | Slope open cut tunnel supporting structure and construction method thereof |
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| CN102535511A (en) * | 2012-01-11 | 2012-07-04 | 重庆大学 | Grouted rubble and concrete combined gravity retaining wall |
| CN202925554U (en) * | 2012-07-31 | 2013-05-08 | 中天建设集团有限公司天津分公司 | Excavation slope supporting structure for sloping construction |
| CN204385748U (en) * | 2014-12-19 | 2015-06-10 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of novel tunnel structure |
| CN205035821U (en) * | 2015-09-17 | 2016-02-17 | 山东科技大学 | Combined type gravity retaining wall |
| CN106968260A (en) * | 2017-04-05 | 2017-07-21 | 五冶集团上海有限公司 | The device and method come down for Strengthening Tunnel mountain body entrance |
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